Include files for a plugin not including

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I have a plugin which I need to include a file in but it doesn’t include.

Here’s the example of the tree:

plugin folder
    /themes
    /folder2
    /somefiles
    /includeme.php

Within themes is

/default
/theme2

Then within each theme are the files
E.g.

Header.php
Footer.php

The plugin simply switches these themes via the admin.

Now in header.php I added

<?php include('includeme.php'); ?>

Which didn’t work.

A friend told me since it is two levels up the tree I should actually add 

<?php include('/../../includeme.php'); ?>.

Both didn’t work.

I googled something that said to try. 

<?php include([$_SERVER]['DOCUMENT_ROOT']'./wp-content/plugins/plugin-name/includeme.php'); ?>.

That also didn’t work.
This is a basic plugin which renders theme based on admin settings combined with user agent detection.

Any suggestions or further code required?

The code is located at http://pastebin.com/A3buAA0R

1 Answer
1

In your main plugin file, use plugin_dir_path to define a constant that you can then use in all of your includes. see the example on the above codex page.

// define the constant in your main plugin file
define( 'MYPLUGINNAME_PATH', plugin_dir_path(__FILE__) );

then, to include your file:

include MYPLUGINNAME_PATH . 'includeme.php';

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